Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75b3e3837d91492…

MALICIOUS

PDF

181.3 KB Created: 2021-06-30 00:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99ce26938ef1296a3cdf8635286a1fd0 SHA-1: 9e93d95311334bb1acf14858350ddf15cff460e6 SHA-256: d75b3e3837d91492dd5403c79e4fd9cf6e62103b60e48b2777d6a8abb6ad7f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to act as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs clearly show a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=phase+velocity+is+given+by PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dedfac0b6---wemebexarim.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079998ec205b---gutomokijokedeziju.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69a84bc55cfe24187721adac436baca8/vavasupirisuki.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/kixub.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ce8d6aeca152570577c92cb66a66ba5e/89853696169.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc59f1250---85590701095.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/gamunagabalovewekunaluk.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4e98a0a19704511a8b3ca8425f7502c3/mamuse.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/44313210010.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/nomulevix.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/58bdf6fe9f0cf4c6a932a4e3528f96b1/81629580719.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/jomutum.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c9e94289---xozamisubepekujomalil.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/razetazopupovubepuvobudup.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/bexixewezew.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/buxuzigenukajinowogup.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9a387e311673d60f0145775f3062612/82037703103.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d440a4fc74---vejikasatirazi.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/77815561694.pdfIn PDF document text
    • http://consade.com/userfiles/file/zodepepasotudax.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8531706b507ee80a5909b1274133bc7f/dowoxo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e7be0075401070fc5f8c6e3f17e3727e/vakiti.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/37338271514.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/91764805998.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002780c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2780C 10728 bytes
SHA-256: f7613cb475eb15ef5d92f0c2e1b04804eb48672d5d4d788861d43b6142554593
font_02_sfnt_off000290b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290B5 22124 bytes
SHA-256: 8f2f10b8af1bf4dd30b9a47cedca27acd4d7f8d3a2a948ccbc492712c7429b53

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